function formatDate(time,format='YY-MM-DD hh:mm:ss'){
    var date = new Date(time);

    var year = date.getFullYear(),
        month = date.getMonth()+1,//月份是从0开始的
        day = date.getDate(),
        hour = date.getHours(),
        min = date.getMinutes(),
        sec = date.getSeconds();
    var preArr = Array.apply(null,Array(10)).map(function(elem, index) {
        return '0'+index;
    });////开个长度为10的数组 格式为 00 01 02 03

    var newTime = format.replace(/YY/g,year)
        .replace(/MM/g,preArr[month]||month)
        .replace(/DD/g,preArr[day]||day)
        .replace(/hh/g,preArr[hour]||hour)
        .replace(/mm/g,preArr[min]||min)
        .replace(/ss/g,preArr[sec]||sec);

    return newTime;
}